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Generalized Adiabatic Two-Phase Pressure Drop Correlation in Evaporative Micro/Mini-Channels

[+] Author Affiliations
Wei Li, Zan Wu

Zhejiang University, Hangzhou, China

Paper No. MNHMT2009-18065, pp. 111-118; 8 pages
doi:10.1115/MNHMT2009-18065
From:
  • ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer
  • ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 2
  • Shanghai, China, December 18–21, 2009
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 978-0-7918-4390-1 | eISBN: 978-0-7918-3864-8
  • Copyright © 2009 by ASME

abstract

This paper presents an adiabatic two-phase pressure drop correlation using quality, the reduced pressure, Bond number, Froude number and Weber number covering wide range of channel dimensions, working fluids and operational conditions. With the channel diameter less than 3.25mm, existing adiabatic two-phase pressure drop database and correlations are reviewed. However, none of the existing correlations can predict the data sets precisely. Theoretically, there are four forces related to two-phase flow in channels: body forces, inertia, viscous and surface tension. The basic reason for the difference between conventional channel and micro-channel is the relative significance of the four forces. Thus, Bo (body forces/surface tension), Fr (inertia forces/gravitational forces) and We (inertia forces/surface tension) were included in the new correlation. Viscous force is considered in the reduced pressure term. The new correlation predicts the existing data sets accurately. Furthermore, Bond number could be used as a criterion to classify a flow path as a micro-channel or conventional channel.

Copyright © 2009 by ASME

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